Lens barrel for a camera having a non-rotatable cam ring moved b

Details Lens barrel for a camera having a non-rotatable cam ring moved b Lens barrel for a camera having a non-rotatable cam ring moved b

1997-01-22

2000-03-14

Metjahic, Safet

Photography

Having variable focal length of camera objective

Having focus operation

396 87, 359696, 359823, 348357, G02B 1514, G03B 1700

Patent

active

060384042

ABSTRACT:
A varifocal mechanical correction mechanism for a lens barrel for a camera, wherein the mechanism drives a lens with a pair of cam rings for carrying out zooming and focusing functions. One of the cam rings is caused to linearly move in and out along an optical axis by a feed screw. The feed screw that has a shank portion outside a normal feed range and on a non-threaded portion of a shaft.

REFERENCES:
patent: 4821972 (1989-04-01), Wakabayashi
patent: 4873542 (1989-10-01), Nakayama
patent: 5301066 (1994-04-01), Higuchi et al.
patent: 5319498 (1994-06-01), Hara et al.
patent: 5392159 (1995-02-01), Sasaki et al.
patent: 5576894 (1996-11-01), Kuwana et al.

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